Adjustable connector

ABSTRACT

According to one aspect of the present invention there is provided an adjustable connector including at least two parts, each having a main body with a bore having a longitudinal axis therein, wherein an external surface of the main body of a first part is configured to bear against an internal surface of the bore of a second part when the first part is at least partially inserted into the bore of the second part to form a connection, characterized in that the positioning of the bores with respect to the main bodies is such that when the parts are connected to each other, rotation of one part with respect to the other changes the inclination of the longitudinal axes of the bores with respect to one another.

RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 12/677,238 filed Dec. 2, 2010, which is herebyincorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to an adjustable connector. In particular,it relates to an adjustable connector for connecting and orienting twoor more bodies with respect to one another.

BACKGROUND ART

The relative orientation of two or more connected objects often can be acritical aspect of the way the objects perform their function. This maybe illustrated simply with reference to a golf club, although thoseskilled in the art will recognize numerous other products and situationswhere similar issues arise and reference throughout this specificationto golf clubs only should not be considered limiting.

A golf club has a shaft connected to a club head through an aperture,called a hosel, in the club head. The relative orientation of the clubhead with respect to the shaft is a critical element in the performanceof the club. Two aspects are particularly important: the lie angle,which relates to an angle between the shaft and a lateral directionthrough the club head; and the loft angle, which relates to the slope ofthe club head with respect to a plane through the shaft and the clubhead. In essence, in the normal golfing stance with a golf club near thecontact point with a golf ball, the lie corresponds to the angle betweenthe shaft and the club head, while the loft corresponds to the degree ofbackward rotation of the club head with respect to the shaft. These twoangles relate to rotations of the club head with respect to the shaftabout two different axes.

Golf clubs for different shots generally will have different lie andloft angles. However, even for similar clubs (e.g., 8 irons) there isgenerally a range of lie and loft angles to suit different golfers.

Individual golfers may vary significantly in size, and have vastlydiffering athletic abilities, and therefore need a variety of customconfigurations available to customize their golf equipment. Ideally agolfer should be easily able to change the following:

-   -   1. the club length    -   2. the grip type    -   3. the shaft type    -   4. the lie angle    -   5. the loft    -   6. the head weight and balance characteristics

In general when a different golf club is required due to a change in thesize or stance of the golfer, or a change in their ability, it isnecessary to purchase a new club or to alter the existing one.

However the prior art methods for modifying a club are very limited.Specifically the methods used currently are:

-   -   1. The club length is only changed by removing the grip, cutting        or extending the shaft, and gluing a new grip on.    -   2. The grip type is only changed by removing the grip, and        gluing a new grip on.    -   3. The shaft type is changed with great difficulty by heating up        the hosel area of the club with a gas torch to break the epoxy        glue joint, and then gluing a new shaft in place, and waiting        for the new glue to cure before playing with the club.    -   4. The lie angle is changed in a somewhat arbitrary way by        applying a lever bar to the shaft (or club head) and pulling        hard on the bar. This method can damage the club and is        inaccurate.    -   5. The loft is changed in a similar manner to the lie angle as        described immediately above. This method can also damage the        club and is imprecise.    -   6. The head weight and balance characteristics are the only        adjustments which have been improved upon in recent years, with        some premium branded clubs having weight ports which, allow a        set of weights inside the club head to be exchanged.

In particular there is no current method whereby the relativeorientation of the shaft and club head can be adjusted for both lieangle and loft in a precise and controlled manner, nor any method ofadjustment that does not have the potential (at least) to cause damageto the club. In practice, when a golfer wishes to change the lie angleor loft of a club it is generally necessary to purchase a new club,which adds extra cost to the golfer.

One consequence of this is the necessity for suppliers of golf clubs tomaintain an inventory of clubs that cover the wide variation of lie andloft for each club. If a reliable and accurate method was available forvarying the lie and loft of a club then it would be possible for asupplier to stock a smaller range of clubs which could be individuallyadjusted to the desired settings, thus saving costs to the supplier.

Another issue that could be addressed is the variation that can occurduring manufacture of a golf club. It could be that a club may have alie angle and/or loft that is different than that designated for theclub as a consequence of manufacturing variation. It would be useful tohave a method of correcting for this which could benefit the golfer byproviding an accurately formed club, and the manufacturer/supplier inreduction of discarded clubs due to manufacturing error.

Adjustment of a golf club has been discussed here as an example of acommon situation where adjustment of the relative orientation of twoobjects, in this case a shaft and a club head of a golf club. Howeverthe general situation is very common, especially where the orientationof an object with respect to a shaft is involved.

One common situation arises when an object is made to revolve about ashaft, such as a wheel or fan about its axle. In most instances abearing is used to separate the revolving object from the axle. However,the revolving object can be unbalanced often causing unwanted forces tobe applied to the bearing. This generally causes wear on the bearing andcan result in the bearing requiring replacement sooner than would be thecase for a balanced load.

One common cause of imbalance is a misalignment of the natural axis ofrotation of the revolving object with the axis of the bearing. It wouldbe useful to have a bearing that could be adjusted in order to align theaxes.

It is an object of the present invention to address the foregoingproblems or at least to provide the public with a useful choice.

All references, including any patents or patent applications cited inthis specification are hereby incorporated by reference. No admission ismade that any reference constitutes prior art. The discussion of thereferences states what their authors assert, and the applicants reservethe right to challenge the accuracy and pertinency of the citeddocuments. It will be clearly understood that, although a number ofprior art publications are referred to herein, this reference does notconstitute an admission that any of these documents form part of thecommon general knowledge in the art, in New Zealand or in any othercountry.

It is acknowledged that the term ‘comprise’ may, under varyingjurisdictions, be attributed with either an exclusive or an inclusivemeaning. For the purpose of this specification, and unless otherwisenoted, the term ‘comprise’ shall have an inclusive meaning—i.e. that itwill be taken to mean an inclusion of not only the listed components itdirectly references, but also other non-specified components orelements. This rationale will also be used when the term ‘comprised’ or‘comprising’ is used in relation to one or more steps in a method orprocess.

Further aspects and advantages of the present invention will becomeapparent from the ensuing description which is given by way of exampleonly.

DISCLOSURE OF INVENTION

According to one aspect of the present invention there is provided anadjustable connector including at least two parts, each having a mainbody with a bore having a longitudinal axis therein,

wherein an external surface of the main body of a first part isconfigured to bear against an internal surface of the bore of a secondpart when the first part is at least partially inserted into the bore ofthe second part to form a connection

characterized in that

the positioning of the bores with respect to the main bodies is suchthat when the parts are connected to each other, rotation of one partwith respect to the other changes the inclination of the longitudinalaxes of the bores with respect to one another.

According to another aspect of the present invention there is providedan adjustable connector substantially as described above wherein, inuse, the connector connects two or more objects such that rotation ofone part of the connector with respect to the other changes theorientation of the objects with respect to one another.

Reference to an adjustable connector throughout this specificationshould be understood to refer to a device which, in use, is connectedto, or forms part of, two or more objects, the device being configuredsuch that adjustment of the adjustable connector alters the relativeorientation of the objects.

In a preferred embodiment the main body of at least one part issymmetric with respect to rotation of the main body about a longitudinalaxis of rotation.

Preferably at least the main body of the first part is symmetric withrespect to rotation of the main body about a longitudinal axis ofrotation.

A body that is symmetric with respect to rotation about an axis maygenerally be one in which a cross section through the body at rightangles to the axis of rotation has a circular perimeter.

For example, the main body of the first part may be in the form of asolid cylinder (containing an internal bore). The axis of rotation ofsuch a part is the imaginary line extending longitudinally through thecentral points of the cross section of the cylinder.

In a preferred embodiment the external surface of the main body of thefirst part is configured as a straight sided cylinder.

Reference to a straight sided cylinder throughout this specificationshould be understood to refer to a cylinder in which the cross sectionthrough the body at right angles to the axis of rotation has a circularperimeter of constant radius.

In a preferred embodiment the internal surface of the bore of the secondpart is configured to be complementary to the external surface of themain body of the first part.

Generally speaking two complementary bodies are configured such thatwhen fitted together they form a complete whole—i.e., one body fills ahole in the other body. However, for the purposes of this specificationit should be understood to mean that one body is shaped to substantiallyfill an aperture in the other body to the extent that the two bodiesoverlap. In other words as the main body of the first part is insertedinto the bore of the second part it substantially fills the bore in theregion where the two parts overlap. Furthermore, in the presentinvention the fit between the internal surface of the bore in the secondpart and the external surface of first part is such that the first partand second parts may be rotated with respect to one another.

This arrangement ensures that the external surface of the main body ofthe first part may be slidably engaged into the bore of the second part.

In this preferred embodiment the above means that the internal surfaceof the bore of the second part is also configured as a straight sidedhollow cylinder of substantially the same radius as the external surfaceof the first part.

In some other embodiments the main body of a part may have a variableradius along the longitudinal axis while retaining rotational symmetry.For example, the radius could vary along the longitudinal axis to form atapered or conical form, or a combination of tapered and straight sided(constant radius) sections. Such variable radius forms could be used,for example, to secure the main body of the part within a complementaryaperture in another object. However, the main body of the part may stillbe able to rotate within the aperture.

In a preferred embodiment the main body of at least one part has alongitudinal axis which is inclined with respect to the longitudinalaxis of the bore of that part.

The longitudinal axis of the bore may differ from the axis of rotationby being displaced laterally (i.e., the two axes are parallel but notcollinear) or by being inclined to it (the two axes intersect at anangle). In each case rotation of the main body causes a similar rotationof the axis of the bore.

In a preferred embodiment the longitudinal axis of the bore of each partis inclined with respect to the axis of rotation of the main body ofthat part.

The angle between the axis of rotation of the main body of a part andthe longitudinal axis of the bore of that part will be referred to asthe angle of inclination of the bore.

In such embodiments rotation of the main body about its axis of rotationcauses the longitudinal axis of the bore to rotate (at a constant angleof inclination) with respect to the axis of rotation of the main body.In this way the relative orientation (with respect to the axis ofrotation of the main body) of an object connected to the main body ofthe part and another object connected to the bore of the part, may bealtered.

In some embodiments the part may be connected to an object which itselfhas an axis of rotation, such as a straight cylindrical shaft forexample. In such embodiments the main body of the part may be consideredto be a section of the object to be connected. The section of the objectforming the main body of the part in such embodiments includes a bore,wherein the longitudinal axis of the bore is different from the axis ofrotation of the object.

In some embodiments it may be desirable to have a main body of a partthat does not have rotational symmetry, that is, has a non-circularperimeter. A cam-shaped main body may be fitted to an object which hasits own axis of rotation, such as a shaft having a bore that is inclinedwith respect to the axis of rotation of the shaft. In such instances itmay be an advantage to use a part having a cam-shaped body that may beinserted into a complementary cam-shaped aperture in the shaft, as thiswill hinder or prevent the part from rotating with respect to the shaft.Rotation of the shaft may be used to alter the orientation between thelongitudinal axis of the bore and the axis of rotation of the shaft.

In some embodiments a bore (or a main body) may include a spline, keydetail, and/or ridges/grooves to limit rotation of the bore with respectto an object (such as the main body of another part or an object to beconnected) in contact with it.

The adjustable connector of the present invention is formed by insertingthe main body of the first part into the bore of the second part, theparts being configured such that the external surface of the main bodyof the first part bears against the internal surface of the bore of thesecond part. When connected in this manner the axis of rotation of themain body of the first part is collinear with (i.e., the same as) thelongitudinal axis of the bore of the second part.

An adjustable connector formed in this way enables full rotation of theparts of the connector independently about two distinct axes ofrotation, namely the axis of rotation of the second part and thelongitudinal axis of the bore of the second part (the latter being theaxis of rotation of the first part when engaged in the bore of thesecond part to form the connector). In a like manner, any objectsconnected to the parts may also be rotated independently about twodistinct axes.

The amount of adjustment available is determined by the angles ofinclination of the bores with respect to the main body of the parts. Themaximum adjustment is given by the sum of the angles of inclination.This occurs when both axes of rotation are in the same plane andinclined in the same general direction. However, by rotating one of theparts with respect to the other (i.e., keeping one part fixed androtating the other) it is possible to vary this from a minimum angle(equal to the difference between the two angles of inclination) up tothe above maximum angle.

Furthermore, by rotating one of the parts only, so that the connectormoves as a single unit, the same adjustment may be applied for anyorientation through 360° C. about the axis of rotation of the part.Further adjustments may be made by combining the above actions, i.e.,rotating the connector about one part together with rotation of theparts with respect to one another.

In a preferred embodiment at least one part includes marking configuredto indicate the orientation of the part.

The marking may be a sequence of numbers, letters or any otherdistinguishable symbols or marks that may be used to identify theorientation of the part.

Preferably the first and second parts include marking configured toindicate their orientation with respect to one another when connectedtogether.

For example the symbols could be arranged around the rims of the twoparts so that they can be readily observed when the parts are assembledto form the adjustable connector. In this manner the relativeorientation of the parts may be readily established by aligning therelevant symbols on each part.

Once the required alignment has been established the parts may be heldin relationship to one another by various means, such as (withoutlimitation) by gluing, clamping or the use of complementary ridges andgrooves on the relevant surfaces of the parts.

Preferably the objects to be connected to the parts of the adjustableconnector include marking configured to indicate the relativeorientation of the object to the part.

In a preferred embodiment at least one part is configured as an autolocked mechanism.

Reference to an auto-locked mechanism throughout this specificationshould be understood to refer to a mechanism which by design, and bydefault, secures the elements (which may be telescoping) relative toeach other. Typically an auto locked mechanism includes a body made froma deformable material. The body is designed such that a tool is requiredto change the shape of the body so as to accept an object to beconnected, and such that the body locks onto the object when the tool isremoved.

Throughout this specification the term deformable material should betaken as meaning a material which is able to deform from its originalshape, and has a resilience or bias to return to its original shape,i.e. the deformable material has a material memory.

In the case of a deformable self-locked mechanism there may generally bean aperture for a tool and a tool designed to deform the body. This toolmay be a:

-   -   1. ever    -   2. wedge    -   3. cam (elliptical or otherwise)    -   4. threaded element (tapered or otherwise)    -   5. conical element (solid, threaded, expandable or otherwise)    -   6. a drivable connection (e.g. a pin or taper)    -   7. an external tool such as modified pliers    -   8. application of heat to thermally expand an aperture or weaken        a mechanical connection

In a preferred embodiment at least one part is deformable.

In a preferred embodiment at least one part is made from a deformablematerial.

In a preferred embodiment at least one part includes a slot.

Reference to a slot should be understood to refer to a gap that extendsthrough the external surface of the part into the bore and at leastpartially along the length of the bore.

In some embodiments the slot may extend at least partially along andaround the part.

In other embodiments at least one part includes a deformable insert.

Preferably the second part of the adjustable connector is an auto lockeddevice. In this embodiment the main body of the second part is made froma deformable material, including a slot. The slot may be helical,straight or otherwise, and extend partially or fully along the main bodyof the part.

A suitable tool may be used to expand the main body of the second partto allow the first part to be inserted into the bore of the second part.When the desired relative orientation of the parts has been set up, forexample using the marking on the two parts, the tool may be removedresulting in the main body of the second part locking the first part inposition. If subsequently a different orientation is required the toolmay be reinserted to release the first part, the relative orientation ofthe parts adjusted and then the parts may be locked together by removalof the tool.

In use, the arrangement of the adjustable connector is such that thefirst object is connected to the bore of the first part and the secondobject is connected to the main body of the second part.

In a preferred embodiment at least one part is configured to engage withan object to be connected.

Preferably the first part is configured to engage with a first object tobe connected and the second part is configured to engage with a secondobject to be connected.

Reference to a part being configured to engage with, or connected to, anobject to be connected should be understood to include a part that isitself an integral section of that object. This would include, forexample, those embodiments where one of the parts is a section of anobject to be attached, as discussed above.

The use of an adjustable connector may be illustrated by application toa golf club. However, those skilled in the art will appreciate thatthere are many other examples that could be used and that reference to agolf club only should not be seen as limiting.

In a preferred embodiment the object to be connected is the shaft of agolf club.

In a preferred embodiment the object to be connected is the club head ofa golf club.

Preferably the shaft of the golf club is connected to the bore of thefirst part of the connector, and the club head is connected to the mainbody of the second part. This arrangement recognizes that the bore ofthe first part may be readily configured to connect with a shaft, whilethe hosel in the club head may be readily configured to connect with themain body of the second part. However, in other embodiments the shaftmay be connected to the main body of the second part and the club headconnected to the first part (for example by forming an extension on theclub head configured to connect with the bore of the first part).

In a preferred embodiment at least one part is releasably connected toan object to be connected.

The advantage of a releasable connection is that the object may bereleased if subsequent re-adjustment is required. This may save time andeffort in making the adjustment, as well as reducing the likelihood ofdamage to the object or adjustable connector, in each case saving cost.

In a preferred embodiment the releasably connected part is connected byan auto-locked mechanism.

For example the hosel of a golf club may be configured to include anauto locked mechanism.

The hosel, and/or club head (where there is no hosel for example), mayhave one or more slots, helical, straight or otherwise, partial or full,and be of sufficient strength either as a unitary item or via the designand/or cooperation of multiple elements (which could include a conical,wedge, split or spring element for example). A suitable tool may be usedto expand the hosel so that it may accept a part of the adjustableconnector, with the part becoming locked in the hosel when the tool isremoved.

Likewise, the shaft of a golf club may be configured to include an autolocked mechanism. The shaft may be made of a deformable material andinclude a slot such that operation of a suitable tool may open the shaftso as to accept a part of the adjustable connector. The shaft may beself-lock to the part on an interior or exterior surface part.

Where the hosel is a deformable body or where the shaft is a deformablebody each may be designed so as to auto lock or otherwise frictionallyengage with a part of the adjustable connector.

Throughout this specification the hosel may be taken to include anyelement in contact with itself. Likewise the shaft may include anyelement in contact with itself. An intermediary element (such as anadjustable connector) which connects the club head and or hosel with theshaft can be taken to be a shaft in some cases and a hosel in others.

In some embodiments the of the auto locked mechanism the shaft may haveone or more slots and be expandable by insertion of a plug element whichbears on the inner surface of the club shaft. The expansion element,which may be helical, solid, compressible, conical, or threaded (forexample), may bear against a surface of the shaft and frictionallyengage. An expansion element may also be inserted from the sole orunderside of the club head.

Any inserted element may also or solely serve to alter the weight of theclub. A plug may retain a lead weight for example within the shaft ofthe hosel, or the plug may be a heavy or light material to achieve adesired change in the weight.

In case of a non-deformable hosel aperture a simple connection may bemade by an interference fit with the hosel. If the aperture of the hoselis so configured the inserted part of the adjustable connector could bedovetailed by interaction with a dovetail creation detail at the apex ofthe hosel.

All detail described for self-locked mechanisms could be used forlocking mechanisms (as in a screwed in tapered element inserted toexpand the split shaft), and vice versa. All details which describe themale form may be advantageously designed in the female form and viceversa.

A self-locked mechanism may use an attached integral or loose springelement. This element may be expanded, shortened or rotationallydeformed to achieve a locking condition.

If a spring element is used a tapered tool could be used to insertinside or outside the spring to frictionally engage. Turning the springor tool in one direction will tend to bind more than the other way andthis can be used to advantage. Alternatively the tool may be tapered orparallel and the inner or outer bore of the spring element be itselftapered. In any case the elements may also be threaded.

Where a cam tool is used to open a self-locking mechanism it may begenerally axially aligned to the axes of the hosel and shaft or begenerally parallel to the axes of the hosel and shaft. However a cam mayalso be in any other orientation that affords a cam operation to releasethe part of the adjustable connector secured by the deformable body. Acam tool is a good design for use in cooperation with a self-lockingdeformable body mechanism as the lever force which opens/releases ordisengages the elements, in this case a club head hosel or a golf shaft,can be defined to be insufficient to elastically deform the mechanism.The major axis of the cam cross section will define the maximal openingachievable by use of the tool.

The hosel may be in a variety of cross sections but a preferredembodiment is one which offers resistance to rotation of the shaftwithin the hosel. This can be achieved when the hosel and or shaft areoval or any other non-circular cross section for at least some of theirlength. Splines, key details, and ridges/grooves may be used for asimilar purpose.

The hosel may be in a variety of cross sections but a preferredembodiment is one which offers resistance to pull out of the shaft. Thismay be achieved when the hosel is wider in internal bore at a pointcloser to the sole end, than the golf clubs grip end, and is oval or anyother non-circular for at least some of their length. Splines, keydetails and ridges/grooves may be used for a similar purpose.

Where a hosel and club shaft are connected by an adjustable connectorand the lie angle and loft has been adjusted, there may be a visualmisalignment of the axes of the hosel and the shaft. To disguise thevariable angle of the shaft relative to the hosel, or to the club headdirectly, a flexible or adjustable ferrule, O-ring (of any crosssection) could be used. This ferrule detail may be separate, but may beclick fitting or part of any of the adjacent parts. In this wayvariation of the shaft to club head angle may be visually disguised sothe club would look more normal to the golfer's eye. This is importantas golf is widely held to be as much a game of confidence as it is ofpure physical skill.

An adjustable connector according to the present invention may provide anumber of advantages over the prior art devices, including:

low manufacturing cost as a result of the simplicity of the parts;

simplicity of use, in that the required relative orientation of theparts may be dialed-up using the marking on the parts, and the partssubsequently locked in position;

precise adjustment is simplified by the use of marks on the parts toindicate their relative orientation;

quick locking and release of the parts through the use of one part as aself-locked mechanism to unlock the parts with a simple operation of atool and to relock the parts by removal of the tool;

the parts of the connector may be configured to make a simple connectionto other objects, especially when the' other objects are also configureas self-locked mechanisms. This may enable multiple adjustments to bemade quickly and simply, with precision and without damaging theadjustable connector or the objects connected to it.

It has numerous applications, including in adjustment of golf clubs asillustrated here, in which case it provides a simple, precise and quickmethod for altering the lie angle and loft of a club, thus increasingthe versatility of the club, enabling a reduction in inventory forsuppliers and providing a simple way of correcting for variation duringmanufacture of the club.

According to another aspect of the present invention there is provided abearing including

at least two parts, each having a main body with a bore having alongitudinal axis therein,

wherein an external surface of the main body of a first part isconfigured to bear against an internal surface of the bore of a secondpart when the first part is at least partially inserted into the bore ofthe second part to form a connection

characterized in that

the positioning of the bores with respect to the main bodies is suchthat when the parts are connected to each other, rotation of one partwith respect to the other changes the inclination of the longitudinalaxes of the bores with respect to one another wherein, in use, one partis freely rotatable with respect to the other part.

A bearing according to this aspect of the invention is an adjustableconnector as described above wherein at least one part is free to rotatewith respect to the other part. Typically one part of the bearing may befixed, for example to a support structure, while the other freelyrotatable part may be connected to an object to be rotated. The fixedpart may be either the first part or the second part.

In one embodiment the bearing may include a third part configured to fitinto the bore of the first part. The third part may be engaged with thebore of the first part in a manner that enables it to rotate freely withrespect to the first part. In this embodiment the first and second partsmay be adjusted as described above for an adjustable connector, with thethird, free rotating part, configured to engage with an object to berotated.

In some embodiments the bearing may include a guide, such as a ball raceor low friction bearing. A guide, in the form of a ball race forexample, may be used to connect the bore of the first part to the thirdpart. Such a guide may provide additional stability and reduce frictionbetween the parts.

A bearing according to this embodiment may provide the advantage ofenabling adjustment of the axis of rotation of the object by manualadjustment of the relative orientation of the first and second parts.Such adjustment may be able to align the natural axis of rotation of theobject with the axis of rotation of the bearing, thus reducing oreliminating any imbalance.

Alternatively, the bearing, in which one of the first or second parts isfreely rotatable in use, may be self-aligning. It is well known that theforces on a rapidly spinning top are such as to tend to keep the topspinning on its natural axis of rotation. A bearing according to thisembodiment may utilize these restoring forces to rotate the parts of theadjustable connector relative to one another so as to self-align theaxes of rotation of the bearing and of the spinning object.

BRIEF DESCRIPTION OF DRAWINGS

Further aspects of the present invention will become apparent from theensuing description which is given by way of example only and withreference to the accompanying drawings in which:

FIG. 1 shows a schematic representation of an adjustable connectoraccording to one embodiment of the present invention; and

FIG. 2 shows schematic representations of parts of an adjustableconnector according to one embodiment of the present invention; and

FIG. 3 shows schematic cross section views of parts of an adjustableconnector according to one embodiment of the present invention; and

FIG. 4 shows an adjustable connector according to one embodiment of thepresent invention in use connecting two bodies together; and

FIG. 5 shows schematic drawings of an adjustable connector; and

FIG. 6 shows schematic drawings of an adjustable connector; and

FIG. 6 shows a schematic view of an adjustable connector according toone embodiment of the present invention; and

FIG. 7 shows an adjustable golf club according to one embodiment of thepresent invention; and

FIG. 8 shows an adjustable golf club according to another aspect of thepresent invention; and

FIG. 9 shows schematic views of a club head and hosel according toanother aspect of the present invention; and

FIG. 10 shows views of a club head and hosel according to another aspectof the present invention; and

FIG. 11 shows a bearing according to another aspect of the presentinvention; and

FIG. 12 shows a schematic cross sectional view of a bearing according toone embodiment of the present invention.

BEST MODES FOR CARRYING OUT THE INVENTION

An adjustable connector according to one embodiment of the presentinvention is indicated by arrow 1 in FIG. 1. A first part, indicated byarrow 2 has a main body (4) and an internal bore (6).

The main body (4) is shown in FIG. 1 as a straight sided cylinder. Theaxis of rotation of the main body (4) is an imaginary line runningthrough the center points of the main body (4).

The bore (6) of the first part (2) is inclined with respect to the axisof rotation of the main body (4).

A second part (3) has a main body (5) in the form of a straight sidedcylinder. The axis of rotation of the main body (5) is an imaginary linerunning through the center points of the main body (5). The second part(3) has a bore (7) as a longitudinal axis (not shown) that is inclinedwith respect to the axis of rotation of the main body (5).

The main body (2) includes marking (8) to indicate the relativeorientation of the first body (2).

Both of the first part (2) and the second part (3) as illustrated inFIG. 1A include a slot (9) in the main body (2, 3).

The second part (3) as illustrated in FIG. 1B has a main body (5)without a slot.

FIG. 2 shows a number of variations to the parts (2, 3).

FIG. 2A shows a part (2, 3) having a main body (4, 5) and an internalbore (6, 7) that is inclined with respect to the axis of rotation of themain body (4, 5). The part (2, 3) includes a linear slot (9).

FIG. 2B indicates a part that is similar to that shown in FIG. 2A butwithout a slot.

FIG. 2C indicates another variation on the part shown in FIGS. 2A and2B, in this case where the part (2, 3) includes a helical slot (10) thatruns along and around the main body (4, 5).

FIG. 2D shows a part similar to that illustrated in FIG. 2B in which theinternal service of the bore (6, 7) includes surface contours (11) inthe form of ridges and grooves.

FIG. 3 shows cutaway sections of the parts illustrated in FIG. 2. Thesecutaway views clearly show the inclination of the internal bore (6, 7)with respect to the axis of rotation of the main body (4, 5) of theparts (2, 3). The axis of rotation of the main body (4, 5) is indicatedby dashed line 17 in FIG. 3A. The longitudinal axis of the bore (6, 7)is indicated by dashed line 18. The angle of inclination is the anglebetween these lines, denoted by a in FIG. 3A.

A stalemate view of an adjustable connector (1) in use connecting afirst object (12) in the form of a shaft and a second object (13) isshown in FIG. 4A. A cutaway view of the same arrangement is shown inFIG. 4B. These two situations are repeated in FIGS. 4C and 4D which showexploded views of the situations illustrated in FIGS. 4A and 4Brespectively. In particular, with reference to FIG. 4D the first part(2) and second part (3) of the adjustable connector (1) clearly show thechange in orientation due to the inclined bores of the two parts (2, 3)at this particular setting of the relative orientation of the parts (2,3).

In use the relative orientation of the parts (2, 3) is first set to thedesired orientation. This may be done for example by using a look uptable to determine the correct setting, as indicated by the markings onthe parts (2, 3). A set of tables may be provided with the variousparts, each table being specific to the particular inclination of thebores within each adjustable connector (1).

Once the setting has been arranged, the parts (2, 3) may be lockedtogether, for example by application of glue or preferably using aself-locking mechanism on the main body of the second part (3) in orderto lock the first part (2) in position. In other cases the second objectto be connected (13) is configured to include a self-locked mechanism.In these embodiments a tool may be used to open the aperture in thesecond object to be attached (13) to allow the adjustable connector (1)to be inserted into the aperture. When at least partially inserted thetool may be removed from the auto locked mechanism causing the object(13) to attempt to return to its normal size and in so doing to clampagainst the main body of the second part (3) locking both it and thefirst part (2) in position.

Similarly, the first object to be connected (12) may include aself-locked mechanism configured to engage with the first part (2), thusforming a locked connection between the first part to be connected (12)and the second part to be connected (13) via the adjustable connector(1). A wide range of different orientations is available by settingdifferent relative orientations for the first part (2) with respect tothe second part (3) of the adjustable connector (1), as illustrated inFIG. 5. The situation illustrated here is similar to that shown in FIG.4. The axis of rotation for the second part (3) is indicated by dashedline (14). In comparison of the angle of inclination of the shaft (12)with respect to the axis of rotation (14) indicates our changing therelative orientation of the parts (2) and (3) with respect to oneanother alters the angle. Applying marks to the first and second partsof the adjustable connector simplifies the setting of the connector, aswell as providing a degree of precision in the setting. FIG. 6 indicatesone arrangement in which marks, in the form of numbers (15) are placedaround the main body (4) of the first part. Similarly marking, in theform of letters (16) may be applied around the main body (5) of thesecond part. The arrangement shown in FIG. 6 includes a shaft (12)connected to the adjustable connector, and a slot (9) in the body of thefirst part.

An adjustable golf club in which an adjustable connector (1) is used toconnect a shaft of a golf club (19) to a club head (20) is shown invarious views in FIG. 7. FIG. 7A shows an exploded view of the connectorarrangement in which the first part (2) of the adjustable connector (1)is connected to the shaft of the golf club (19). The second part (3) ofthe connector (1) is shown just above the hosel (21) of the club head(20). A cover in the form of a ferrule (22) is shown attached to theshaft (19). FIG. 7B shows a similar arrangement from a different aspect.FIG. 7C is a cutaway view through the club head (20) showing the secondpart (3) inserted into the hosel (21). FIGS. 7E and F show the finishedarrangement with the shaft (19) connected to the club head (20) with theadjustable connector (1) embedded to the hosel (21). The ferrule (22) isused to cover the connection mechanism and to mask any slight offsetthere may be due to the adjustment mechanism. These views are shown incross section in FIGS. 7G and H. An adjustable golf club in the form ofan iron is shown in FIG. 8 with the adjustable connector (1) embedded inthe hosel (21) of the club head (20).

FIG. 9 shows a variety of modifications to a club head (20) includingthe provision of a slot (23) through the body of the hosel (21) so thatthe hosel may be used as a self-locking mechanism. Also shown in theplan view of a hosel in FIG. 9B is an aperture through the hosel whichis tapered (see FIG. 9B) and, in FIGS. 9A and D an aperture in the hoselwhich is non-circular. A hosel (21) including two apertures is shown inFIG. 10. With reference for example to FIG. 10B a first aperture (24)configured to accept the adjustment mechanism (not shown) and a secondaperture (25) into which a tool, for example a cam tool, is inserted toopen the hosel to a size where it can accept the adjustable connector.This is one example of how the hosel/club head may be used as aself-locked mechanism.

A bearing accordingly the present invention is illustrated in use inFIG. 11. The bearing, indicated by arrow 26 includes a first part (27)and a second part (28) in which the parts (27 and 28) have a similarform to the parts of the adjustable connector as illustrated in FIGS.1-6. The bearing includes a bearing support (29) and is shown in FIG. 11attached to shaft (30) that is free to rotate. The arrangement in thebearing is such that the first part (27) is free to rotate with theshaft (30).

In use, the relative orientation of the parts (27 and 28) may beadjusted as outlined above for the adjustable connector in order torealign the shaft (30) with respect to the bearing (26) (if required).In this embodiment the relative orientation of the first part (27) tothe second part (28) is fixed and a third part, such as a sleeve isinserted into the bore of the first part (27) so that the sleeve mayfreely rotate with the shaft (30). The axis (31 and 32) shown as dashlines in FIG. 11 indicate the normal main axis of a bearing.

In embodiments where the first part (27) is freely rotatable in the boreof the second part (28) the bearing may self-center as the shaft spinsthrough the action of the restoring forces of the shaft that may arisedue to any misalignment or unbalancing of the shaft or any weightattached to it which causes the first part (27) to re-orientate withrespect to the second part (28) to bring the bearing back intoalignment.

Aspects of the present invention have been described by way of exampleonly and it should be appreciated that modifications and additions maybe made thereto without departing from the scope thereof as defined inthe appended claims.

1. An adjustable connector to connect a golf club head and a golf clubshaft, the adjustable connector comprising: a first part having an outerwall configured to be inserted into a hosel of a golf club head andconfigured to rotate inside the hosel between a first plurality ofrotational positions, said first part having a first internal inclinedbore; and a second part configured to be coupled to a shaft and havingan outer wall received in said first internal inclined bore, said secondpart being rotatable inside said first internal inclined bore between asecond plurality of rotational positions, said second part having asecond internal inclined bore configured to receive the shaft.
 2. Anadjustable connector as claimed in claim 1 wherein the first and thesecond inclined bores are inclined with respect to a longitudinal axisof the bore of that part.
 3. An adjustable connector as claimed in claim1 wherein the outer wall of the first part is configured as astraight-sided cylinder.
 4. An adjustable connector as claimed in claim1 wherein at least one part includes a marking configured to indicatethe orientation of the part.
 5. An adjustable connector as claimed inclaim 1 wherein at least one part is configured to be releasablyconnected to either a golf club shaft or a golf club head.
 6. Anadjustable connector as claimed in claim 1 wherein the second part isslidably engaged with the first part.
 7. An adjustable connector asclaimed in claim 1, wherein the first plurality of rotational positionsis configured to change a first angular relationship between a golf clubhead and a golf club shaft.
 8. An adjustable connector as claimed inclaim 7, wherein the second plurality of rotational positions isconfigured to change a second angular relationship between a golf clubhead and a golf club shaft, wherein the second angular relationship isindependent of the first angular relationship.
 9. An adjustableconnector as claimed in claim 8, wherein the first and second angularrelationships are a lie angle of a golf club head and a loft angle ofsaid golf club head.
 10. An adjustable connector as claimed in claim 8,wherein the first and second angular relationships are a loft angle of agolf club head and a face angle of said golf club head.
 11. Anadjustable connector to connect a golf club head and a golf club shaft,the adjustable connector comprising a pair of radially nested mutuallyindependently rotatable members, one of said members having an outerwall configured to fit inside a golf club head and the other of saidmembers having a bore for receiving a golf club shaft, both membershaving inclined bores whereby two angular relationship parametersbetween said golf club head and said golf club shaft may be adjustedindependently of each other.
 12. An adjustable connector as claimed inclaim 11 wherein the inclined bores are inclined with respect to alongitudinal axis of the bore of that member.
 13. An adjustableconnector as claimed in claim 11 wherein at least one member includes amarking configured to indicate the orientation of the member.
 14. Anadjustable connector as claimed in claim 13, wherein the markingincludes a sequence of numbers.
 15. An adjustable connector as claimedin claim 14, wherein the sequence of numbers is arranged around one ormore of a rim of the first part and a rim of the second part
 16. Anadjustable connector as claimed in claim 11 wherein at least one memberis configured to be releasably connected to either a shaft or a head.17. An adjustable connector as claimed in claim 11, wherein the twoangular relationship parameters are two of the following: a lie angle ofthe head, a loft angle of the head, and a face angle of the head.
 18. Anadjustable connector to connect a golf club head and a golf club shaft,the adjustable connector comprising a pair of radially nested mutuallyindependently rotatable members, one of said members having an outerwall configured to fit inside a golf club head and the other of saidmembers having a bore for receiving a golf club shaft, both membershaving inclined bores such that rotation of one member with respect tothe other member changes the orientation of a golf club shaft and a golfclub head with respect to one another.
 19. An adjustable connector asclaimed in claim 18 wherein the inclined bores are inclined with respectto a longitudinal axis of the bore of that member.
 20. An adjustableconnector as claimed in claim 18 wherein at least one member isconfigured to be releasably connected to either a shaft or a head. 21.An adjustable connector as claimed in claim 18, wherein the orientationof the golf club shaft and the golf club head defines two angularrelationship parameters between said golf club head and said golf clubshaft which may be adjusted independently of each other, wherein the twoangular relationship parameters are two of the following: a lie angle ofthe head, a loft angle of the head, and a face angle of the head.
 22. Anadjustable connector to connect a golf club head and a golf club shaft,the adjustable connector comprising: a first part having an outer wallconfigured to be inserted into a hosel of a golf club head andconfigured to rotate inside the hosel between a first plurality ofrotational positions, said first part having a first internal inclinedbore; and a second part configured to be coupled to a shaft and havingan outer wall received in said first internal inclined bore, said secondpart being rotatable inside said first internal inclined bore between asecond plurality of rotational positions, said second part having asecond internal inclined bore configured to receive the shaft, whereinthe first plurality of rotational positions and the second plurality ofrotational positions corresponds to two of the following: a lie angle ofthe head, a loft angle of the head, and a face angle of the head.
 23. Anadjustable connector as claimed in claim 22 wherein the first and thesecond inclined bores are inclined with respect to a longitudinal axisof the bore of that part.
 24. An adjustable connector as claimed inclaim 22 wherein at least one part is configured to be releasablyconnected to either a golf club shaft or a golf club head.
 25. Anadjustable connector to connect a golf club head and a golf club shaft,the adjustable connector comprising: a first part having an outer wallconfigured to be inserted into a hosel of a golf club head and rotatedinside the hosel between a first plurality of rotational positions, saidfirst part having a first internal inclined bore with respect to alongitudinal axis of the bore of the first part; and a second partconfigured to be coupled to a golf club shaft, the second part having anouter wall that fits into said first internal inclined bore, said secondpart being rotatable inside said first internal inclined bore between asecond plurality of rotational positions, said second part having asecond internal inclined bore configured to receive said golf clubshaft, wherein the first plurality of rotational positions is configuredto change a first angular relationship between a golf club head and agolf club shaft and the second plurality of rotational positions isconfigured to change a second angular relationship between said golfclub head and said golf club shaft, wherein the second angularrelationship is independent of the first angular relationship.
 26. Anadjustable connector as claimed in claim 25 wherein the outer wall ofthe first part is configured as a straight-sided cylinder.
 27. Anadjustable connector as claimed in claim 25, wherein the first andsecond angular relationships are a lie angle of a golf club head and aloft angle of said golf club head.
 28. An adjustable connector asclaimed in claim 25, wherein the first and second angular relationshipsare a loft angle of a golf club head and a face angle of said golf clubhead.
 29. An adjustable connector as claimed in claim 25, wherein thesecond part is slidably engaged with the first part.
 30. An adjustableconnector as claimed in claim 25, wherein the two angular relationshipsare two of the following: a lie angle of a golf club head, a loft angleof a golf club head, and a face angle of a golf club head.
 31. Anadjustable connector to connect a golf club head and a golf club shaft,the adjustable connector comprising: a first part configured to beinserted into a hosel of a golf club head and rotatable inside saidhosel between a first plurality of rotational positions associated witha face angle of said golf club head, said first part having a firstinternal inclined bore with respect to a longitudinal axis of the boreof the first part; and a second part configured to be coupled to a golfclub shaft and insert able into the first part and rotatable inside saidfirst part between a second plurality of rotational positions associatedwith a loft angle of said golf club head, said second part having asecond internal inclined bore configured to receive said golf clubshaft, wherein the first plurality of rotational positions changes theface angle of said golf club head and the second plurality of rotationalpositions changes the loft angle of said golf club head and said golfclub shaft, wherein changing the face angle is independent of changingthe loft angle.